WARNING: This page is about a different car, the 2021 Porsche Macan, 2020 Porsche Macan, and 2019 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Rear Side Member Component Location (Section)
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Installation position of rear side member (section)